本文探討(Mg0.95Zn0.05)4Nb2O9介電材料之共振頻率溫度漂移係數改善方法。為了將其負的共振頻率溫度飄移係數調整至趨近於零，我們添加具正值共振頻率溫度飄移係數的材料SrTiO3 (+1700 ppm/℃)、CaTiO3 (+800 ppm/℃)、Ca0.8Sr0.2TiO3 (+991 ppm/℃)。經由實驗的結果，我們得知0.6(Mg0.95Zn0.05)4Nb2O9–0.4SrTiO3有最佳的微波介電特性，其介電常數約為21.2、Q×f約為136,000 GHz (at 9.3 GHz)及τf約為–5 ppm/℃。
此外，本論文將分別以 FR4、Al2O3及0.6(Mg0.95Zn0.05)4Nb2O9–0.4SrTiO3作為基板來設計一混合耦合帶通濾波器，濾波器的規格為：中心頻率2.4 GHz、頻寬為8%，並使用電磁模擬軟體HFSS來進行電腦模擬。比較使用不同基板的濾波器響應以及元件尺寸，可以發現應用於同一電路上，具有高介電常數和高品質因素的自製基板可以達到縮小電路面積的效果，且有更好的濾波特性。

The improvement of τf of (Mg0.95Zn0.05)4Nb2O9, have been investigated. In order to adjust their negative τf, SrTiO3、CaTiO3 and Ca0.8Sr0.2TiO3 which have positive τf had been add. The experiment result showed that 0.6(Mg0.95Zn0.05)4Nb2O9–0.4SrTiO3 have the best microwave dielectric properties, it’s K ~ 21.2, Q×f ~ 136,000 GHz (measured at 9.3 GHz) and τf ~ –5 ppm/℃.
Besides, a bandpass filter using mixed coupling structure have been designed on FR4、Al2O3 and 0.6(Mg0.95Zn0.05)4Nb2O9–0.4SrTiO3 substrates. The band-pass frequency is 2.4 GHz, the bandwidth is 8% and simulated by electromagnetic simulation. We could find that with the higher dielectric constant and Q×f , our filter could diminish the scale of size and demonstrate better frequency response.

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